Door-sprsng



(Model.)

H. LEWRY.

lDOOR SPRING.

No. 356,001. Patented Jan.. 11, 1887.

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HENRY LEVY, OF MONTGOMERY, ALABAMA.

SPECIFICATIOF forming part of Letters Patent No.356,00l, dated January l1, 1887.

Application filed November 1, 1886. SerialNo. 217,696. (Model.) i

Improvements in Door-Springs; and I do here-A by declare the following to be a full, clear, and

exact description of the invention, such as will` enable others skilled in the art to which it appertains to make and use the same.

rllhis invention relates to that class of doorclosers which are operated by coiled springs; and it has for its object to provide a simple device whereby the action ofthe spring is automatically checked to prevent the door slamming or closing violently, as will be hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification, Figure lis a View of my improved door-closer in position; Fig. 2, an enlarged View ofthe bottom or the device, and Fig. 3 a horizontal section through the barrel.

Similarletters refer to similar parts throughy out the several views.

A represents the upper part of a door-casing, and B the upper part of a door. To the door-casing, above the door and about six inches from a vertical line drawn through the hinges, l secure, by means of screws or nails, the bracket C of my improved door-closer. This bracket consists simply ofa plate of metal provided with perforations near each of its ends, and is preferably cast integral with the barrel ordrum D,which contains the flat coiled spring E. The outer end of this spring is secured in any desired manner to the inner surface of the barrel D, and its outer end is provided with a slot, a, to embrace a pin, b, cast on the main shaft F, so that when the latter is turned or rotated toward the right, Fig. 3, the spring will be wound round it. The ends of shaft F project through openings formed in the top and bottom ofthe barrel or drum and are reduced to receive the grooved pulley Gand toothed wheel H, the former being on its npper and the latter on its lower end. A short shaft, K, is ,rigidly secured to the bottom of the barrel in any desired manner, and on this shaft a pinion-wheel, L, is loosely mounted, so that it may rotate on the same. To the grooved pulley G one end of a cord or rope, g, is secured, and connected by its other end to an arm or hook, M, which is secured to the door, either in line with, or, as shown, slightly to one side of the barrel D of the device.1 The wheel H is provided with five short teeth and one long one, h, and meshes with the pinion L, which has seven teeth, the space between two of which, on opposite sides, is shorter, or is lled out, so as to presenta concave surface at m.

The object of so forming the wheel H and pinion L is to check the action of the spring, and the operation is as follows: The device being located, as described above, on the casing a short distance from the hinged sideof the door, and the arm M being secured to the door a short distance to one side of or in line with the barrel ofthe device, and the cord or rope wound around the pulley and secured to said arrn, so that it will hang somewhat loose or slack, the opening of the door will rotate the shaft F and wind the spring around the same, and at the same time rotate the wheel H, which, meshing with the pinionv L, will turn the same until the rounded or convex end of tooth h meets the concave surface m between the teeth of pinion L, the contact between the two offering a resistance to the further turning of the shaft, but which can be overcome by slightly pushing the door to force the tooth It past the concave surface, this action occurring with a sixtoothed wheel and seven-toothed pinion at every fourth revolution of the'wheel. When the door is closing, the same action is repeated, but in a less degree, as the resilience of the spring will at the start force the parts past each other with hardly a perceptible stop or` want of action until the door is nearly closed, when, the reslience growing weaker and the cord being slack, the parts will engage and hold the door slightly open, or if they are forced apart, will offer such resistance to the spring that the door will close gently, or without violence.

The object of locating the device near the hinged side of the door and the arm to one side of or in line therewith is to permit the door to be opened wide or back against a wall,where it will remain or be held by the device because 0f the end of the arm and the pulley being h and the concave m should be of hard metal. Having thus described my invention7 what I claim as new, and desire' to secure by Letters Patent, is-

The combination, in a door-c1oser, of the drum D, spring E, shaft F, the toothed Wheel H, one tooth of which projects beyond its general circumference, and the pinion L, having two of its interdentel spaces on'lopposite sides shortened and conoaved, substantially as set forth.

In testimony whereof I affix my signature in presence of two' Witnesses.

HENRY LEVVY.Y

Witnesses:

M. S. Mosns, H. C. Mosns. 

